Table 1 Annual incidence of erythema migrans (EM) diagnoses per 100,000 inhabitants of the Netherlands for each survey year, predicted for varying response rates, and stratified for the GP practices that responded to 1 to 2, 3 to 4, or all 5 of our GP surveys
Survey year | 1994 | 2001 | 2005 | 2009 | 2014 |
|---|---|---|---|---|---|
% Population coverage | 88 % | 68 % | 71 % | 65 % | 62 % |
Mean incidence of EM | 38.6 (37.2–40.0) | 74.3 (72.0–76.6) | 103.8 (101.0–106.6) | 133.9 (130.5–137.5) | 139.6 (135.3–144.1) |
Incidence of EM (and 95 % CI) per number of GP practices responding to 1 to 5 surveys: | |||||
1 to 2 surveys | 39.0 (36.7–41.4) | 72.3 (66.9–78.1) | 112.9 (102.6–123.8) | 131.7 (124.8–138.8) | 133.7 (127.5–140.2) |
3 to 4 surveys | 38.3 (35.8–40.9) | 77.9 (74.6–81.2) | 102.0 (89.3–105.9) | 136.6 (131.0–142.3) | 137.7 (130.2–145.8) |
5 surveys | 38.5 (36.2–40.8) | 73.0 (69.2–77.2) | 104.0 (99.4–109.0) | 132.3 (126.3–138.4) | 150.6 (141.5–160.1) |
Incidence of EM (and 95 % CI) among municipalities with population coverage: | |||||
60 % coverage | 40.2 (32.5–49.0) | 73.0 (67.6–78.8) | 99.6 (91.4–108.8) | 132.3 (123.5–142.7) | 139.8 (129.1–152.0) |
75 % coverage | 39.5 (35.2–44.6) | 76.3 (71.2–81.8) | 104.5 (98.4–111.1) | 135.7 (127.6–144.7) | 141.0 (131.5–151.8) |
90 % coverage | 38.8 (36.4–41.5) | 79.5 (71.2–88.5) | 109.5 (101.2–118.0) | 139.0 (127.8–150.7) | 142.1 (129.7–155.9) |